Comtech CRS Series-300 1:10 Modem Redundancy Switch

Description

The Comtech CRS-300 1:10 Modem Redundancy Switch provides fully automatic or manual redundancy for the following modems:

• CDM-570A & CDM-570AL, CDM-625 & CDM-625A, CDM-700, CDM-570, CDM-570L, CDM-Qx, CDM-QxL, CDM-710, CDM-600, CDM-600L, SLM-5650A, CDM-710G

The protection system consists of a maximum of 10 traffic modems, a redundant modem, and the Comtech CRS-300 redundancy switch. Two companion (slaved) 1:10 switches are also available: the CRS-280/ 280L IF switch and the CRS-350 ESC switch. The IF switch is used in multiple transponder applications. The CRS-350 is used for open network ESC redundancy switching.

Compatibility
The CRS-300 supports a wide range of terrestrial data interface types including: EIA-422/530, V.35, EIA-232, LVDS, G.703 (balanced or unbalanced), ASI, 10/100/1000 Ethernet and HSSI. In many cases, each traffic modem can have a different terrestrial data interface types.

Comtech CRS Series-300 1:10 Modem Redundancy Switch Features:

• Twin, independent AC or DC power supplies
• Passive backplane for signal path
• Non-interruption of normal traffic upon power failure
• Non-interruption of user data when other traffic modem Interface circuit cards are removed
• Data and clock provided to the redundant modem when in Bridge Mode
• Programmable holdoff times to backup or restore
• Audible alarm programmable to activate, based on various changes in status
• Provides single-point remote Monitor and Control (M&C) to switch and traffic modems
• Simplified configuration and control
• 2 line x 24 character vacuum fluorescent display
• Front panel keypad
• LED system status display showing unit and modem status, online/offline status, and bridge status

Superior Functionality
The configuration of each traffic modem is stored in the Comtech CRS-300 controller. This information is used to program the redundant modem if the traffic modem fails. The modem information is copied to the controller through a serial cable. The Comtech CRS-300 also controls the traffic and redundant modem IF output. All modem outputs are ON if the CRS-280 or CRS-280L IF switch is used in the system. The downlink path through the CRS-280/ CRS-280L is completely passive. External monitor and control may be connected to the Comtech CRS-230 controller board. The Comtech CRS-300 and each traffic modem may be monitored or controlled through this remote serial interface.

The data and clock signals to and from a traffic modem are routed through a Traffic Modem Interface (TMI) via a set of relays. This allows the data signals to pass directly through to the traffic modem in the event of a power failure. If the system’s power supplies are lost, or if a TMI carrying traffic is removed, no interruption of traffic occurs. The Bridge Mode may be used to verify the user data on a specific traffic modem. The redundant modem locks to the traffic modem receive IF input signal. The operator can program a delay interval for the backup modem to wait before coming online when a traffic modem failure occurs.

Comtech EF Data Corporation is a leading supplier of satellite bandwidth and link optimisation. Comtech’s high-performance satellite communications infrastructure solutions feature groundbreaking efficiency, robust intelligence and unparalleled horsepower. Commercial and government users around the world utilise our solution suite to reduce OPEX/CAPEX and to increase throughput for the most demanding fixed and mobile networks.